Thanks all for the comments. This project is currently in hiatus. I made all the pieces but I forgot to bring one of the "butt" home so it was soaked and became useless. My son, being the destroyer, decided to play with the only silencer/barrel and drop it somewhere in my garage. Now the SMG has no head and butt! Grrr! Hopefully I can get it completed by end of September.

Thank you all for your interest in this build. First off, I can say that I have no patience at all in trying to finish this. You can tell by the lack of quality in my work. This was an experiment and I wasn't expecting this to be perfect. Plus, it was a toy for my kids on the Halloween.

Here I present you the final painted SMG. Not exactly the right size.

Over the years I experimented with other kind of build. Here is a pepakura M6A that I did last year. This was actually destroyed by my son, again. I was able to salvage most of it and finished it up with a fresh coat of paint. Note that the trigger is missing.

Two months ago I tried the cardboard method. Here is the results.

Here are the 3 guns with 3 different build methods. The method I prefer is using cardboard. It requires a lot of planning and scratch building, but I can put more details in it. And if I plan correctly, the gun is the right size with the right details.